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<?php
/*
* This file is part of composer/ca-bundle.
*
* (c) Composer <https://github.com/composer>
*
* For the full copyright and license information, please view
* the LICENSE file that was distributed with this source code.
*/
namespace Composer\CaBundle;
use Psr\Log\LoggerInterface;
use Symfony\Component\Process\PhpProcess;
/**
* @author Chris Smith <chris@cs278.org>
* @author Jordi Boggiano <j.boggiano@seld.be>
*/
class CaBundle
{
/** @var string|null */
private static $caPath;
/** @var array<string, bool> */
private static $caFileValidity = array();
/**
* Returns the system CA bundle path, or a path to the bundled one
*
* This method was adapted from Sslurp.
* https://github.com/EvanDotPro/Sslurp
*
* (c) Evan Coury <me@evancoury.com>
*
* For the full copyright and license information, please see below:
*
* Copyright (c) 2013, Evan Coury
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @param LoggerInterface $logger optional logger for information about which CA files were loaded
* @return string path to a CA bundle file or directory
*/
public static function getSystemCaRootBundlePath(?LoggerInterface $logger = null)
{
if (self::$caPath !== null) {
return self::$caPath;
}
$caBundlePaths = array();
// If SSL_CERT_FILE env variable points to a valid certificate/bundle, use that.
// This mimics how OpenSSL uses the SSL_CERT_FILE env variable.
$caBundlePaths[] = self::getEnvVariable('SSL_CERT_FILE');
// If SSL_CERT_DIR env variable points to a valid certificate/bundle, use that.
// This mimics how OpenSSL uses the SSL_CERT_FILE env variable.
$caBundlePaths[] = self::getEnvVariable('SSL_CERT_DIR');
$caBundlePaths[] = ini_get('openssl.cafile');
$caBundlePaths[] = ini_get('openssl.capath');
$otherLocations = array(
'/etc/pki/tls/certs/ca-bundle.crt', // Fedora, RHEL, CentOS (ca-certificates package)
'/etc/ssl/certs/ca-certificates.crt', // Debian, Ubuntu, Gentoo, Arch Linux (ca-certificates package)
'/etc/ssl/ca-bundle.pem', // SUSE, openSUSE (ca-certificates package)
'/usr/ssl/certs/ca-bundle.crt', // Cygwin
'/opt/local/share/curl/curl-ca-bundle.crt', // OS X macports, curl-ca-bundle package
'/usr/local/share/curl/curl-ca-bundle.crt', // Default cURL CA bunde path (without --with-ca-bundle option)
'/usr/share/ssl/certs/ca-bundle.crt', // Really old RedHat?
'/etc/ssl/cert.pem', // OpenBSD
'/usr/local/etc/openssl/cert.pem', // OS X homebrew, openssl package
'/usr/local/etc/openssl@1.1/cert.pem', // OS X homebrew, openssl@1.1 package
'/opt/homebrew/etc/openssl@3/cert.pem', // macOS silicon homebrew, openssl@3 package
'/opt/homebrew/etc/openssl@1.1/cert.pem', // macOS silicon homebrew, openssl@1.1 package
'/etc/pki/tls/certs',
'/etc/ssl/certs', // FreeBSD
);
$caBundlePaths = array_merge($caBundlePaths, $otherLocations);
foreach ($caBundlePaths as $caBundle) {
if ($caBundle && self::caFileUsable($caBundle, $logger)) {
return self::$caPath = $caBundle;
}
if ($caBundle && self::caDirUsable($caBundle, $logger)) {
return self::$caPath = $caBundle;
}
}
return self::$caPath = static::getBundledCaBundlePath(); // Bundled CA file, last resort
}
/**
* Returns the path to the bundled CA file
*
* In case you don't want to trust the user or the system, you can use this directly
*
* @return string path to a CA bundle file
*/
public static function getBundledCaBundlePath()
{
$caBundleFile = __DIR__.'/../res/cacert.pem';
// cURL does not understand 'phar://' paths
// see https://github.com/composer/ca-bundle/issues/10
if (0 === strpos($caBundleFile, 'phar://')) {
$tempCaBundleFile = tempnam(sys_get_temp_dir(), 'openssl-ca-bundle-');
if (false === $tempCaBundleFile) {
throw new \RuntimeException('Could not create a temporary file to store the bundled CA file');
}
file_put_contents(
$tempCaBundleFile,
file_get_contents($caBundleFile)
);
register_shutdown_function(function() use ($tempCaBundleFile) {
@unlink($tempCaBundleFile);
});
$caBundleFile = $tempCaBundleFile;
}
return $caBundleFile;
}
/**
* Validates a CA file using opensl_x509_parse only if it is safe to use
*
* @param string $filename
* @param LoggerInterface $logger optional logger for information about which CA files were loaded
*
* @return bool
*/
public static function validateCaFile($filename, ?LoggerInterface $logger = null)
{
static $warned = false;
if (isset(self::$caFileValidity[$filename])) {
return self::$caFileValidity[$filename];
}
$contents = file_get_contents($filename);
if (is_string($contents) && strlen($contents) > 0) {
$contents = preg_replace("/^(\\-+(?:BEGIN|END))\\s+TRUSTED\\s+(CERTIFICATE\\-+)\$/m", '$1 $2', $contents);
if (null === $contents) {
// regex extraction failed
$isValid = false;
} else {
$isValid = (bool) openssl_x509_parse($contents);
}
} else {
$isValid = false;
}
if ($logger) {
$logger->debug('Checked CA file '.realpath($filename).': '.($isValid ? 'valid' : 'invalid'));
}
return self::$caFileValidity[$filename] = $isValid;
}
/**
* Test if it is safe to use the PHP function openssl_x509_parse().
*
* This checks if OpenSSL extensions is vulnerable to remote code execution
* via the exploit documented as CVE-2013-6420.
*
* @return bool
*/
public static function isOpensslParseSafe()
{
return true;
}
/**
* Resets the static caches
* @return void
*/
public static function reset()
{
self::$caFileValidity = array();
self::$caPath = null;
}
/**
* @param string $name
* @return string|false
*/
private static function getEnvVariable($name)
{
if (isset($_SERVER[$name])) {
return (string) $_SERVER[$name];
}
if (PHP_SAPI === 'cli' && ($value = getenv($name)) !== false && $value !== null) {
return (string) $value;
}
return false;
}
/**
* @param string|false $certFile
* @param LoggerInterface|null $logger
* @return bool
*/
private static function caFileUsable($certFile, ?LoggerInterface $logger = null)
{
return $certFile
&& self::isFile($certFile, $logger)
&& self::isReadable($certFile, $logger)
&& self::validateCaFile($certFile, $logger);
}
/**
* @param string|false $certDir
* @param LoggerInterface|null $logger
* @return bool
*/
private static function caDirUsable($certDir, ?LoggerInterface $logger = null)
{
return $certDir
&& self::isDir($certDir, $logger)
&& self::isReadable($certDir, $logger)
&& self::glob($certDir . '/*', $logger);
}
/**
* @param string $certFile
* @param LoggerInterface|null $logger
* @return bool
*/
private static function isFile($certFile, ?LoggerInterface $logger = null)
{
$isFile = @is_file($certFile);
if (!$isFile && $logger) {
$logger->debug(sprintf('Checked CA file %s does not exist or it is not a file.', $certFile));
}
return $isFile;
}
/**
* @param string $certDir
* @param LoggerInterface|null $logger
* @return bool
*/
private static function isDir($certDir, ?LoggerInterface $logger = null)
{
$isDir = @is_dir($certDir);
if (!$isDir && $logger) {
$logger->debug(sprintf('Checked directory %s does not exist or it is not a directory.', $certDir));
}
return $isDir;
}
/**
* @param string $certFileOrDir
* @param LoggerInterface|null $logger
* @return bool
*/
private static function isReadable($certFileOrDir, ?LoggerInterface $logger = null)
{
$isReadable = @is_readable($certFileOrDir);
if (!$isReadable && $logger) {
$logger->debug(sprintf('Checked file or directory %s is not readable.', $certFileOrDir));
}
return $isReadable;
}
/**
* @param string $pattern
* @param LoggerInterface|null $logger
* @return bool
*/
private static function glob($pattern, ?LoggerInterface $logger = null)
{
$certs = glob($pattern);
if ($certs === false) {
if ($logger) {
$logger->debug(sprintf("An error occurred while trying to find certificates for pattern: %s", $pattern));
}
return false;
}
if (count($certs) === 0) {
if ($logger) {
$logger->debug(sprintf("No CA files found for pattern: %s", $pattern));
}
return false;
}
return true;
}
}
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